Infest Definition
ĭn-fĕst
infested, infesting, infests
verb
infested, infesting, infests
To overrun or inhabit in large numbers, usually so as to be harmful or bothersome; swarm in or over.
Webster's New World
To be parasitic in or on (a host)
Webster's New World
To live as a parasite in or on tissues or organs or on the skin and its appendages.
American Heritage Medicine
adjective
(obsolete) Mischievous; hurtful; harassing.
Wiktionary
Origin of Infest
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Middle English infesten to distress from Old French infester from Latin īnfestāre from īnfestus hostile gwhedh- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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From Middle English infesten, from Old French infester (“to infest”), from Latin īnfestō (“assail, molest”, verb), from īnfestus (“hostile”).
From Wiktionary
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